Anatomy Of The Ear Flashcards
Three major divisions of the temporal bone
Pinna,
Internal vs external ear?
Tympanic membrane and out is external ear
What are the parts of the external ear?
When does the ear form embryologically?
Helix, anti helix, concha, Travis, antitragus
Can understand the abnormal ear
28 weeks
External carotid A
Anteriorly:Superficial temporal A
Posteriorly: Posterior auricular A
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Cartilage next to the perichondrium gets blood supply fomr
Cartilaginous loos, necrosis, chondroneogenesis
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Auricular temporal N
Lesser occipitral N
Great auricular N
Vagus N
Facial N
J
Posterior to floor is vagus
Stimulation of vagus N in auditory canal causes cough reflex
J
Intraparotid nodes, gastric nodes,
J
Outer 2/3 bone, 1/3 cartilage
Skin and periosteum is outer covering
J
Sensory to external TM is CN 5, 7, 10
Medial TM is CN 9
Squamous mucosa
Two layers of ____ give the TM its rigidity. Middle is respiratory mucosa
G
Ring on outside is annulus
Pars tense: contains fibrous structures
Pars flaccida: just contianns the external squamous portion and internal mucosa -> most affected to pressure change because no rigid CT
J
Incus and malleus is in the epitympani
K
Adults have a deeper angle of descent of the eustacuan tube
Kids have shallowe tube therefore get more infections
R
Mesotympanum: 2nd brachial arch
Epitympanum: head, neck come from 1st brachial arch
U
H
Chorda tympani
Taste to anterior 2/3 of tongue
M
Facial N bends and gives off greater petrosal N
Exits out sylomastoid foramen into parotid gland
H
Four nerve of internal auditory canal: posterior two
Superior vestibular N: utricle, superior canal, horizontal canal
Inferior vestibular nerve: saccule, posterior semicircular canal
Cochlear N goes to cochlear and innervates cochlear
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Fluid stays the same
Turn head, horizontal canals make horizontal morning
Tilt headed, superior canal is in sync with inferior canal
Utricle gives horizontal motion
J
Scala vestibuli: fluid movement is influences by stapes
Scala tympani
Scala media
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Scala media
Cochlear has tone topic orientation: different parts of the cochlear reacts to different levels of sound
Base high tones
Top high tones
